Who Should Not Have Laser Eye Surgery? Complete Eligibility Guide

Laser eye surgery has helped millions of people reduce their dependence on glasses and contact lenses. Procedures such as LASIK, PRK, and SMILE can safely correct common vision problems, including nearsightedness, farsightedness, and astigmatism. However, laser eye surgery is not suitable for everyone.

If you have certain eye conditions, medical conditions, unstable vision, or lifestyle factors that affect healing, your eye surgeon may recommend delaying treatment or choosing a different vision correction option.

In this comprehensive guide, you’ll learn who should not have laser eye surgery, why some people are not ideal candidates, what tests determine eligibility, and what alternatives may be available.

Quick Answer

You may not be a suitable candidate for laser eye surgery if you have:

• Thin or irregular corneas
• Keratoconus or other corneal diseases
• Severe dry eye syndrome
• Cataracts requiring surgery
• Uncontrolled glaucoma
• Active eye infections
• Progressive changes in your eyeglass prescription
• Pregnancy or breastfeeding
• Certain autoimmune disorders
• Poorly controlled diabetes
• Extremely high refractive errors outside treatment limits
• Unrealistic expectations about the results

The only way to know whether laser eye surgery is appropriate for you is through a comprehensive eye examination performed by an experienced ophthalmologist.

What is Laser Eye Surgery?

Laser eye surgery is a group of procedures designed to reshape the cornea—the clear, dome-shaped front surface of the eye—so that light focuses more accurately on the retina. This improves vision and can reduce or eliminate the need for glasses or contact lenses.

Modern laser vision correction is highly precise, and advances in technology have made treatment safer and more predictable than ever before. Even so, every procedure has eligibility requirements to help ensure the best possible outcomes.

Common Types of Laser Eye Surgery

LASIK (Laser-Assisted In Situ Keratomileusis)

LASIK is the most widely performed laser vision correction procedure. During treatment, a thin flap is created in the cornea, and a laser reshapes the underlying tissue before the flap is repositioned.

Best suited for:

• Mild to moderate myopia
• Hyperopia
• Astigmatism
• Patients with adequate corneal thickness

PRK (Photorefractive Keratectomy)

PRK reshapes the cornea without creating a flap. Instead, the outer layer of the cornea is removed and naturally regenerates during healing.

PRK may be recommended for patients with thinner corneas or those involved in contact sports where flap-related injuries are a concern.

SMILE (Small Incision Lenticule Extraction)

SMILE is a minimally invasive laser procedure that removes a small piece of corneal tissue through a tiny incision.

Potential benefits include:

• Smaller incision
• Reduced disruption of corneal nerves
• Lower likelihood of postoperative dry eye in selected patients
• Faster recovery for many individuals

Your ophthalmologist will recommend the most appropriate procedure based on your eye health, prescription, and lifestyle.

How Does Laser Eye Surgery Work?

Normally, the cornea bends incoming light so it focuses directly on the retina. When the eye’s shape causes light to focus incorrectly, blurred vision occurs.

Laser vision correction carefully reshapes the cornea to improve how light enters the eye.

It can treat:

• Nearsightedness (Myopia)
• Farsightedness (Hyperopia)
• Astigmatism

The procedure usually takes only a few minutes per eye, while the laser itself is active for less than a minute in many cases.

Who Should Not Have Laser Eye Surgery?

Not everyone is a suitable candidate for laser eye surgery. While LASIK, PRK, and SMILE have excellent safety records when performed on carefully selected patients, certain eye conditions, medical conditions, and lifestyle factors can increase the risk of complications or reduce the likelihood of achieving the desired visual outcome.

In some cases, laser eye surgery may simply need to be postponed until the condition improves. In others, an alternative procedure may provide a safer and more effective solution.

Below are the most common reasons why an ophthalmologist may advise against laser eye surgery.

Thin Corneas

One of the most common reasons patients are not eligible for LASIK is having corneas that are too thin. During LASIK, a small amount of corneal tissue is removed to reshape the eye and correct refractive errors. If the remaining cornea would be too thin after treatment, the eye may become structurally weaker, increasing the risk of complications such as corneal ectasia.

Why Thin Corneas Matter

The cornea must remain strong enough to maintain its natural shape after surgery. Removing excessive tissue can compromise this stability and may lead to progressive vision problems.

How It is Diagnosed

Your eye surgeon measures corneal thickness using the following:

• Corneal pachymetry
• Corneal topography
• Corneal tomography

These painless imaging tests help determine whether your cornea can safely undergo laser treatment.

Possible Alternatives

If your corneas are thinner than ideal, your ophthalmologist may recommend:

• PRK, if appropriate
• Implantable Collamer Lens (ICL) surgery
• Prescription glasses
• Contact lenses

The best option depends on your prescription, corneal health, and overall eye examination.

Keratoconus or Other Corneal Diseases

Keratoconus is a progressive condition in which the cornea gradually becomes thinner and bulges outward into a cone-like shape. Because laser eye surgery removes corneal tissue, performing LASIK on someone with keratoconus can significantly worsen the condition.

Signs of Keratoconus

• Rapid prescription changes
• Increasing astigmatism
• Blurred or distorted vision
• Double vision in one eye
• Poor night vision

Why LASIK is Usually Not Recommended

Patients with keratoconus already have weakened corneas. Removing additional tissue increases the risk of further thinning and irregular corneal shape.

Treatment Options

Depending on the stage of the disease, treatment may include:

• Corneal collagen cross-linking
• Speciality contact lenses
• Intracorneal ring segments
• Corneal transplantation in advanced cases

Early diagnosis is essential because treatment can help slow or stop disease progression.

Severe Dry Eye Disease

Dry eye disease is another common reason laser eye surgery may be delayed or avoided. Laser procedures temporarily affect the corneal nerves responsible for stimulating tear production. If your eyes are already significantly dry, symptoms may worsen after surgery.

Symptoms of Dry Eye

• Burning sensation
• Gritty feeling
• Red eyes
• Excessive tearing
• Fluctuating vision
• Eye fatigue

Why It Matters

Healthy tears are essential for:

• Corneal healing
• Clear vision
• Comfort after surgery
• Reduced infection risk

Can Dry Eye Be Treated First?

Yes. Many patients become eligible after successful treatment.

Common therapies include:

• Artificial tears
• Prescription eye drops
• Warm compresses
• Eyelid hygiene
• Punctal plugs
• Lifestyle modifications

Once the ocular surface is healthy, your surgeon can reassess your candidacy.

Unstable Vision Prescription

Laser eye surgery is intended to provide long-term correction for stable vision. If your eyeglass or contact lens prescription continues to change, the results may not remain accurate over time.

Causes of Changing Prescriptions

• Young age
• Progressive myopia
• Hormonal changes
• Diabetes
• Certain medications

General Guideline

Most surgeons prefer your prescription to remain stable for at least one year before surgery. Waiting until your vision stabilises improves the chances of long-lasting results.

Active Eye Infections or Inflammation

Laser eye surgery should never be performed while an active infection or significant inflammation is present.

Examples include:

• Conjunctivitis (pink eye)
• Keratitis
• Corneal ulcers
• Blepharitis
• Uveitis

Operating during an active infection increases the risk of poor healing, scarring, and vision-threatening complications.

Treatment should focus on resolving the infection first. Once your eyes have fully recovered, your ophthalmologist can determine whether surgery is appropriate.

Corneal Scarring

Previous eye injuries, infections, or surgeries can leave scars on the cornea. Depending on their location and severity, these scars may interfere with laser treatment or limit the quality of vision after surgery.

Your surgeon will carefully evaluate:

• Scar depth
• Scar location
• Corneal clarity
• Corneal stability

In some cases, another vision correction procedure may be more appropriate than LASIK.

Large Pupils

People with naturally large pupils may experience more visual disturbances after laser eye surgery, particularly in low-light environments.

Possible Symptoms

• Halos around lights
• Increased glare
• Starbursts
• Reduced nighttime driving comfort

Modern laser platforms have reduced this risk considerably, but pupil size remains an important part of the preoperative evaluation. Your surgeon will measure your pupils under different lighting conditions before recommending treatment.

Very High Refractive Errors

Laser eye surgery has treatment limits.

Patients with extremely high levels of:

• Nearsightedness (myopia)
• Farsightedness (hyperopia)
• Astigmatism

may not achieve optimal results with LASIK alone.

Why Treatment Limits Exist

Correcting very high prescriptions often requires removing more corneal tissue, which may not be safe.

Excessive correction can also increase the likelihood of:

• Undercorrection
• Overcorrection
• Regression
• Visual aberrations

Alternative Procedures

Depending on your prescription, alternatives may include:

• Implantable Collamer Lens (ICL)
• Refractive Lens Exchange (RLE)
• Combination procedures
• Continued use of glasses or contact lenses

Previous Eye Surgery

Patients who have previously undergone eye surgery require careful assessment before considering laser vision correction.

Examples include:

• Corneal transplant
• Cataract surgery
• Retinal surgery
• Previous LASIK or PRK
• Glaucoma procedures

Prior surgery may alter the structure of the eye or affect healing, making additional laser treatment unsuitable in some cases. A personalized evaluation is essential.

Frequent Eye Injuries or High-Risk Occupations

Certain professions and activities may influence the choice of vision correction procedure.

Examples include:

• Military personnel
• Professional athletes
• Martial artists
• Boxers
• Law enforcement officers
• Firefighters

Because LASIK involves creating a corneal flap, individuals with a high risk of eye trauma may be better candidates for PRK or another alternative. Your surgeon will consider your occupation and lifestyle when recommending the safest option.

Unrealistic Expectations

Good candidates understand both the benefits and limitations of laser eye surgery.

It is important to know that:

• Results vary from person to person.
• Some patients still need glasses for reading or certain tasks.
• Vision naturally changes with age.
• Laser surgery does not prevent cataracts or other age-related eye conditions.

Patients who expect perfect vision under all circumstances may be disappointed, even after a technically successful procedure. Having realistic expectations is an important part of achieving a satisfying outcome.

Temporary vs. Permanent Reasons to Avoid Laser Eye Surgery

Not every exclusion is permanent. Some conditions improve with treatment, while others require choosing a different vision correction method.

Condition	Temporary or Permanent?	Possible Next Step
Dry eye disease	Often temporary	Treat dry eye and reassess
Pregnancy	Temporary	Wait until after pregnancy and vision stabilises
Active eye infection	Temporary	Complete treatment before evaluation
Unstable prescription	Temporary	Wait until vision stabilises
Thin corneas	Usually permanent	Consider PRK or ICL if appropriate
Keratoconus	Usually permanent for LASIK	Corneal cross-linking and other treatments
Advanced cataracts	Permanent for LASIK	Cataract surgery may be recommended
Severe glaucoma	Depends	Individual evaluation by an ophthalmologist

The key takeaway is that being told you are not a LASIK candidate does not necessarily mean you have no vision correction options. Many patients achieve excellent results with alternative procedures tailored to their eye health and visual needs.

Medical Conditions That May Make Laser Eye Surgery Unsafe

Your overall health is just as important as your eye health when determining whether laser eye surgery is appropriate. Certain medical conditions can interfere with healing, increase the risk of infection, or affect the stability of your vision after the procedure.

Having one of these conditions does not automatically mean you can never have laser eye surgery. In many cases, your ophthalmologist will evaluate how well the condition is controlled before making a recommendation.

Autoimmune Diseases

Autoimmune diseases occur when the body’s immune system mistakenly attacks its own healthy tissues. Because laser eye surgery relies on proper wound healing, some autoimmune disorders may increase the risk of delayed healing, inflammation, or infection.

Common autoimmune conditions include:

• Rheumatoid arthritis
• Lupus
• Sjögren’s syndrome
• Multiple sclerosis
• Inflammatory bowel disease
• Psoriasis with systemic involvement

Why It Matters

Some autoimmune diseases can:

• Slow corneal healing
• Increase chronic dry eye symptoms
• Affect tear production
• Raise the risk of postoperative inflammation

Patients with mild, stable autoimmune conditions may still be candidates after a thorough evaluation, while those with active or poorly controlled disease may be advised to delay surgery.

Diabetes

Many people with diabetes successfully undergo laser eye surgery, but careful screening is essential.

When Diabetes May Be a Concern

Laser eye surgery may not be recommended if you have:

• Poorly controlled blood sugar levels
• Diabetic retinopathy
• Diabetic macular edema
• Frequent vision fluctuations
• Slow wound healing

High blood sugar can temporarily change your prescription, making it difficult to achieve predictable surgical outcomes.

Can People With Well-Controlled Diabetes Have LASIK?

Yes. If your diabetes is well managed, your prescription is stable, and there is no significant diabetic eye disease, laser eye surgery may still be an option.

Your surgeon may also recommend a retinal examination before deciding whether the procedure is appropriate.

Pregnancy and Breastfeeding

Pregnancy is generally considered a temporary reason to postpone laser eye surgery. Hormonal changes during pregnancy can affect both the shape of the cornea and tear production, leading to temporary changes in vision.

Why Surgeons Recommend Waiting

During pregnancy and breastfeeding:

• Vision may fluctuate.
• Dry eye symptoms may increase.
• Corneal measurements may change.
• Certain medications used around surgery may not be appropriate.

Most ophthalmologists recommend waiting until after pregnancy and breastfeeding have ended and your vision has remained stable for several months before scheduling surgery.

Chronic Dry Eye Related to Systemic Disease

Some medical conditions reduce tear production, making laser eye surgery less suitable.

Examples include:

• Sjögren’s syndrome
• Rheumatoid arthritis
• Thyroid eye disease
• Chronic graft-versus-host disease

These conditions can increase discomfort after surgery and may delay corneal healing. Treating dry eye disease before considering laser vision correction often improves both comfort and surgical outcomes.

Medications That Affect Healing

Certain prescription medications can interfere with healing or increase the risk of complications after laser eye surgery.

Examples include:

• Oral corticosteroids
• Isotretinoin (commonly used for severe acne)
• Some immunosuppressive medications
• Certain medications that contribute to dry eye symptoms

Never stop taking prescribed medication on your own. Instead, inform your ophthalmologist about every medication and supplement you use so they can assess whether any adjustments are necessary.

Uncontrolled Allergies

Severe eye allergies can affect the surface of the eye and make postoperative recovery more uncomfortable.

Common symptoms include:

• Itchy eyes
• Excessive rubbing
• Redness
• Swelling
• Watering

Frequent eye rubbing may also contribute to corneal problems over time. Managing allergies before surgery can improve healing and reduce the risk of complications.

Conditions That Affect Wound Healing

Laser eye surgery depends on the body’s ability to repair the cornea effectively.

Conditions that impair healing may increase surgical risk, including:

• Poorly controlled diabetes
• Certain connective tissue disorders
• Nutritional deficiencies
• Smoking-related vascular disease
• Chronic inflammatory conditions

Your surgeon will evaluate your overall health and medical history to determine whether healing is likely to proceed normally.

Eye Conditions That Can Prevent Laser Eye Surgery

Some eye diseases directly affect the structures that laser vision correction relies on. Treating these conditions often takes priority over refractive surgery.

Cataracts

A cataract occurs when the natural lens inside the eye becomes cloudy, leading to blurred vision, glare, and reduced contrast sensitivity. Because LASIK reshapes the cornea rather than replacing the cloudy lens, it does not treat cataracts.

Why Cataracts Matter

If a cataract is the primary cause of reduced vision, cataract surgery is usually the more appropriate treatment.

During cataract surgery, your ophthalmologist may be able to implant a premium intraocular lens (IOL) that also corrects refractive errors, reducing your need for glasses.

Glaucoma

Glaucoma damages the optic nerve, often due to increased pressure inside the eye. Having glaucoma does not always rule out laser eye surgery, but it requires careful evaluation.

Factors Your Surgeon Will Consider

• Type of glaucoma
• Disease severity
• Eye pressure control
• Visual field results
• Optic nerve health
• Current glaucoma medications

Because LASIK temporarily increases eye pressure during part of the procedure and changes corneal thickness, it can also affect future eye pressure measurements. Patients with glaucoma should be evaluated by an ophthalmologist experienced in both glaucoma management and refractive surgery.

Retinal Diseases

The retina is responsible for converting light into signals that the brain interprets as vision. If retinal disease is limiting your eyesight, laser eye surgery cannot correct the underlying problem.

Examples include:

• Retinal tears
• Retinal detachment
• Diabetic retinopathy
• Macular degeneration
• Epiretinal membrane
• Macular hole

A dilated retinal examination is an important part of the preoperative assessment, especially for patients with high myopia.

Macular Degeneration

Age-related macular degeneration affects central vision and becomes more common with increasing age. Although LASIK can correct refractive errors, it cannot restore vision lost from macular degeneration. Patients with significant retinal disease should discuss realistic expectations with their eye specialist before considering refractive surgery.

Optic Nerve Disorders

Conditions affecting the optic nerve may limit visual improvement after surgery.

Examples include:

• Optic neuritis
• Ischemic optic neuropathy
• Congenital optic nerve abnormalities

Since laser eye surgery changes how light enters the eye but does not treat optic nerve disease, these conditions must be carefully evaluated beforehand.

Age Considerations

Age alone does not determine whether someone is eligible for laser eye surgery, but it plays an important role in deciding the most appropriate treatment.

Under 18 Years

Laser eye surgery is generally not recommended because vision is still developing and prescriptions often continue to change.

Ages 18 to 40

Many healthy adults in this age group are suitable candidates if:

• Their prescription has remained stable.
• Their eyes are healthy.
• They have adequate corneal thickness.
• They understand the benefits and limitations of surgery.

Over Age 40

After age 40, many people develop presbyopia, an age-related condition that reduces the ability to focus on nearby objects.

Even after successful LASIK, reading glasses may still be needed for close work.

Some patients benefit from specialised treatment strategies, such as monovision LASIK, but suitability varies.

Over Age 60

Older adults may still be candidates if their eyes are healthy. However, cataracts become increasingly common with age.

If cataracts are already affecting vision, cataract surgery with an appropriate intraocular lens often provides greater long-term benefit than laser vision correction.

Can You Become Eligible Later?

Yes. Some reasons for postponing laser eye surgery are temporary.

Examples include:

• Pregnancy
• Breastfeeding
• Active eye infection
• Unstable vision
• Untreated dry eye
• Recent changes in medication

Once these issues have been addressed and your eye health is stable, your ophthalmologist may reassess your eligibility.

The goal is not simply to perform surgery—it is to ensure that the procedure is as safe, effective, and predictable as possible for your individual circumstances.

Medical Disclaimer: This content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified eye care professional or healthcare provider for personalized advice regarding your eye health.